Facile Sulfuration Route to Enhance the Supercapacitor Performance of 3D Petal‐like NiV‐Layered Double Hydroxide

Abstract

The charge conductivity properties and ionic delivery of pseudocapacitive materials are important factors for the charge storage process. Herein, the new petal-like S-NiVlayered double hydroxide (LDH) materials are successfully synthesized by a presynthetic solvothermal reaction and a sulfidation modification procedure. The specific capacitance of the new petal-like S-NiV-LDHs electrode reaches 1403 F g À1 when the current density is 1 A g À1 , and this is attributed to Ni 3 S 2 formed on the surface of NiV-LDHs. When the current density is up to 20 A g À1 , the rate performance of the new petal-like S-NiV-LDHs electrode is 65.04%. It can be seen that the comprehensive electrochemical performance of the new petal-like S-NiV-LDHs is better than the petal-like NiV-LDHs before modification. When the power density of the S-NiV-LDHs//activated carbon asymmetric supercapacitor cell is 2278.48 W kg À1 , its energy density is 20 Wh kg À1 . The innovation of this work lies in that, based on the microstructure of petal-like NiV-LDHs with rich mesoporous structure, the surface of petal-like NiV-LDHs is slightly sulfurized, which makes the new petal-like S-NiV-LDHs electrode material have smaller electrochemical impedance, richer oxidation states, richer chemical active sites, better energy storage, and cycle stability.

Graphdiyne-Modified NiV-Layered Double Hydroxide Nanostructures for Supercapacitor Applications

“…The planes at (110), (009), (006), and (003) of the NiV-LDHs (NiV-LDHs PDF#052-1627) correspond to characteristic diffraction peaks at 60.19°, 34.52°, 23.47°, and 11.59°, respectively. 30 Interestingly, the (110), ( 009), (006), and (003) feature planes of NiV-LDHs can be attributed to the peaks of NiV-LDHs/GDY at 60.32°, 34.48°, 23.30°, and 11.69°, which further indicates that the basic framework of NiV-LDHs has not changed. In addition, the XRD peaks of NiV-LDHs/GDY did not show an orderly negative shift after recombination, which was caused by the small amount of GDY introduced.…”

“…The correct and reasonable crystal patterns of GDY nanosheets, nanoflower NiV-LDHs, and nanoflower NiV-LDHs/GDY were analyzed and clarified. The planes at (110), (009), (006), and (003) of the NiV-LDHs (NiV-LDHs PDF#052-1627) correspond to characteristic diffraction peaks at 60.19°, 34.52°, 23.47°, and 11.59°, respectively . Interestingly, the (110), (009), (006), and (003) feature planes of NiV-LDHs can be attributed to the peaks of NiV-LDHs/GDY at 60.32°, 34.48°, 23.30°, and 11.69°, which further indicates that the basic framework of NiV-LDHs has not changed.…”

“…Broadly speaking, the nanoflower NiV-LDHs/GDY could be potential candidate materials for future clean energy storage equipment. O were evenly dispersed in a PTFE lining containing 30 mL ultrapure water, and then the PTFE lining was sealed in a high-pressure reactor, and the reaction was carried out for 12 h at 120 °C, 30 whereafter NiV-LDHs were obtained by centrifugal drying. Li's team reported the synthesis of hexa [(trimethylsiliconyl) acetylene] benzene.…”

Interfacial Modification to Nanoflower-Like NiV-Layered Double Hydroxide for Enhancing Supercapacitor Performance

“…The mass-specific capacitance retention rates of P-NiV-LDHs-8//AC asymmetric supercapacitor (ASC) and Se-NiV-LDHs-1//AC ASC are 84.62% and 78.95%, respectively. Compared with previous work on the surface vulcanization modification of NiV-LDHs, 21 the microstructure of NiV-LDHs was slightly modified by phosphating and selenization. At the same time, the overall electrochemical performance of NiV-LDHs was improved.…”

“…19 Among transition-metal compounds, Ni 3 S 2 , NiSe 2 , and Ni 2 P materials have attracted much attention from scholars due to their advantages, such as more exposed active sites and more abundant oxidation valence states. 20 Based on previous work, 21 the electrode materials were surface-modified based on the abundant mesoporous microstructure of LDHs, so that the surface of LDHs could be exposed to more electrochemical active sites and have better energy storage, better stability, and more negligible electrochemical impedance to improve the electrochemical performance of the preparation of electrode materials.…”